requirements.txt: Update coala-utils

Update coala-utils and setuptools to use the
check_logs decorator in coala-utils 0.7.0
and to prevent CI failure due to change in
coala-utils requirements respectively.

.travis.yml

@@ -48,7 +48,7 @@ before_install:
   # Apart from builds with python 2.7 and 3.5, it installs setuptools
   # twice. So, it is required to uninstall one version manually.
   - pip uninstall setuptools --yes
-  - pip install pip==9 setuptools==19
+  - pip install pip==9 setuptools==21
   - python .misc/check_setuptools.py
 
   # https://github.com/coala/coala/issues/3183

requirements.txt

@@ -1,5 +1,5 @@
 appdirs~=1.4
-coala_utils~=0.6.2
+coala_utils~=0.7.0
 colorlog~=2.7
 dependency_management~=0.4.0
 # libclang-py3 version numbering maps to the clang releases
@@ -8,6 +8,6 @@ packaging~=16.8
 Pygments~=2.1
 PyPrint~=0.2.6
 requests~=2.12
-setuptools>=19.0
-testfixtures~=4.14.3
+setuptools>=21.0.0
+testfixtures~=5.3.1
 unidiff~=0.5.2